屏蔽发热 shield heating
屏蔽发热 shield heating
相关考题：
()isaprocessinwhichthetemperatureofaspaceoritscontentsisreducedtobelowthatoftheirsurroundings。 A、VentilationB、RefrigerationC、AirconditioningD、Heating
The desirable properties of a marine fuel oil should include .A.high flash point and high viscosityB.low flash point and high viscosityC.low heating value and high sulphur contentD.high heating value and low sulphur content
共用题干第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.According to paragraph 3,energy consumed in home heating over the next two decades will increase byA:33 per cent.B:31 per cent.C:21 per cent.D:14 per cent.
共用题干第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.Which of the following statements is NOT true,according to the article?A:Natural gas comes partly from Canadian fields.B:Bottled gas is more expensive than utility gas.C:Equipment for home heating has been considerably improved.D:Solar heating dominated America in 2000.
The Interior Plains lie between（）and（）Athe Canadian Shield/the Appalachian RegionBthe Canadian Shield/the Rocky MountainsCthe Great Lakes/the Arctic IslandsDthe Appalachian Region/the Great Lakes
The Interior Plains lie between（）and（）A、the Canadian Shield/the Appalachian RegionB、the Canadian Shield/the Rocky MountainsC、the Great Lakes/the Arctic IslandsD、the Appalachian Region/the Great Lakes
Which of the following type of lamp is used for heating a fuser？（）A、XenonB、HalogenC、IncandescentD、Light Emitting Diode
单选题When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.Aaimed at the source of the flamesBfogged above the equipmentCshot off a flat surface onto the flamesDused to shield against electrical shock
单选题The desirable properties of a marine fuel oil should include（）Ahigh flash point and high viscosityBlow flash point and high viscosityClow heating value and high sulphur contentDhigh heating value and low sulphur content
单选题The flash-evaporator is different with the submerged-tube evaporator in that for the former（）AWater is heated into vapor on heating surfacesBWater is vaporized by pressure differenceCThere are no heating-transfer surfacesDThere are more heating-transfer surfaces
单选题In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called （）.AevaporationBdistillationCdehydrationDcondensation
问答题Replace the dots with a word to make five new words. (...) SURFER / SHIELD / SOCK / MILL / PIPE
单选题In general, the oil mist detectors include a built-in heating unit and a compact plug for electrical connectionThe function of heating unit is to （）Aavoid false alarms as a result of condensing water vaporBavoid danger of frost under very cold weatherCreduce the viscosity of the crankcase atmosphere in order to improve the fluidityDkeep the temperature of the oil mist detectors in an appropriate range
单选题The Interior Plains lie between（）and（）Athe Canadian Shield/the Appalachian RegionBthe Canadian Shield/the Rocky MountainsCthe Great Lakes/the Arctic IslandsDthe Appalachian Region/the Great Lakes
单选题The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.AwheneverBhoweverCwhereverDwhether
单选题When approaching a fire from win ward, you should shield firefighters from the fire by using（）Alow-velocity fogBhigh-velocity fogCa straight stream of waterDfoam spray
单选题Cracks in the cylinders and cylinder covers may （） unequal heating.Aresult fromBresult inCgive outDgiven from
填空题What is the possible result of the incompletion of the heating system?The incompletion of the heating system may cause ____ to Ms. Green.